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NEW QUESTION # 44
If a cell covers a high-speed railway on which UEs travel at 250 km/h, which PRACH format should be selected for that cell?
Answer: A
Explanation:
PRACH Format 3 is the intended selection because its 5 kHz subcarrier spacing provides greater tolerance to Doppler shift than the 1.25 kHz spacing associated with the other listed long-preamble formats.
The Physical Random Access Channel (PRACH) is used by the UE to initiate random-access procedures, including initial access and applicable mobility-related synchronization procedures.
In high-speed railway environments, rapidly moving UEs experience significant Doppler frequency shifts due to their motion relative to the serving base station.
Doppler shift is approximately proportional to carrier frequency and radial velocity.
At a UE speed of 250 km/h, the Doppler frequency can become sufficiently large to impair correlation and detection performance when narrow PRACH subcarrier spacing is used.
According to the standardized PRACH configurations, Formats 0, 1, and 2 use 1.25 kHz subcarrier spacing, while Format 3 uses 5 kHz.
The wider spacing reduces the relative frequency-offset sensitivity of the random-access preamble, helping improve detection reliability in high-mobility conditions.
PRACH planning must also account for maximum cell radius, propagation delay, cyclic prefix, and configured random-access occasions.
For the listed long-preamble formats and the stated high-speed scenario, Format 3 is therefore the preferred answer.
Official Reference: 3GPP TS 38.211, Section 6.3.3, Physical Random Access Channel ; TS 38.101-1, Section 6.3.3.4, Table 6.3.3.4-1, PRACH ON Power Measurement Period .
NEW QUESTION # 45
For both the VoNR and EPS fallback solutions, the 5GC must interwork with the IMS.
Answer: B
Explanation:
The statement is true because both Voice over New Radio (VoNR) and Evolved Packet System (EPS) fallback provide voice services through the IP Multimedia Subsystem (IMS), although the radio-access and core-network procedures used to deliver the voice session differ.
In a VoNR deployment, the UE maintains its connection to the 5G Core (5GC) through NR. IMS signaling and media traffic are transported over an appropriate PDU session, with the 5GC supporting QoS-flow establishment, policy enforcement, and connectivity to the IMS network.
The Session Management Function (SMF) manages the corresponding PDU session, while the User Plane Function (UPF) provides user-plane connectivity toward the IMS data network.
EPS fallback applies when the 5G system cannot provide the required IMS voice service directly over its existing radio access.
In this case, the 5GC and NG-RAN coordinate a handover or redirection toward LTE connected to the EPC.
IMS voice establishment or continuation then takes place over the EPS.
Importantly, EPS fallback does not mean that the voice-media path remains anchored in the 5GC after fallback. It means that the 5G system participates in IMS voice-service support and coordinates access to EPS when necessary.
Official Reference: 3GPP TS 23.501, Sections 5.16.3.1-5.16.3.10, IMS Support and IMS Voice Service via EPS Fallback .
NEW QUESTION # 46
Notification Control is used exclusively for GBR QoS flows and is an optional parameter.
Answer: B
Explanation:
The statement is true because Notification Control is an optional Quality of Service (QoS) parameter applicable to Guaranteed Bit Rate (GBR) QoS flows in the 5G system architecture.
In 5G, QoS flows enable differentiated treatment of traffic according to service requirements such as guaranteed throughput, packet delay, reliability, and priority.
GBR QoS flows are characterized by Guaranteed Flow Bit Rate (GFBR) and Maximum Flow Bit Rate (MFBR) parameters.
Notification Control allows the NG-RAN to report when the guaranteed QoS requirements associated with a GBR QoS flow can no longer be satisfied.
According to 3GPP TS 23.501, the Session Management Function (SMF) enables Notification Control when the corresponding QoS Notification Control parameter is present in the Policy and Charging Control (PCC) rule received from the Policy Control Function (PCF).
The parameter is subsequently communicated to the NG-RAN as part of the QoS profile.
When Notification Control is active, the NG-RAN monitors whether the required GFBR, Packet Delay Budget (PDB), and Packet Error Rate (PER) conditions remain achievable.
If these requirements cannot be fulfilled, the NG-RAN sends the appropriate notification toward the SMF.
Notification Control is not mandatory for every GBR QoS flow and is not a standard parameter applied to ordinary non-GBR flows.
Therefore, option A is correct.
Official Reference: 3GPP TS 23.501, Section 5.7.2.4, Notification Control .
NEW QUESTION # 47
In an NSA access issue, which of the following can cause a UE not to report B1 measurement results?
Select All that Apply
Answer: A,B,C,D
Explanation:
All four conditions can prevent a UE from generating or transmitting a valid B1 measurement report during Non-Standalone (NSA) E-UTRA-NR Dual Connectivity (EN-DC) access.
In NSA architecture, the LTE eNodeB acts as the Master Node and configures NR inter-RAT measurements to determine whether an eligible 5G NR cell can be added as a Secondary Node.
Event B1 is triggered when the measured quality of an inter-RAT neighboring cell exceeds the configured threshold, subject to hysteresis and time-to-trigger requirements.
Option A: Excessive received signal power may saturate the UE receiver, degrading synchronization-signal detection and preventing successful NR cell measurements.
Option B: If the LTE-side measurement configuration identifies a frequency that does not correspond to the intended NR SSB carrier, the UE may be unable to detect the target NR synchronization signals.
Option C: If the measured NR signal does not satisfy the configured B1 entry condition, the reporting event is not triggered.
Option D: An abnormal NR cell may fail to transmit the required synchronization signals correctly or provide measurable radio coverage, preventing a valid measurement result.
Therefore, all four conditions are plausible causes of missing B1 measurement reports.
Official Reference: 3GPP TS 36.331, Inter-RAT Measurement Reporting - Event B1 ; TS 38.533, Section
8.4.2, NR Inter-RAT Event-Triggered Reporting Requirements .
NEW QUESTION # 48
The NG interface between the 5G gNodeB and the core network is IP-network based. Which of the following protocols is used on the control plane?
Answer: B
Explanation:
Stream Control Transmission Protocol (SCTP) is the correct answer because it provides the transport-layer signaling service used by the NG control-plane interface between the gNodeB and the 5G Core.
In 5G Standalone (SA) architecture, the NG interface consists of two principal components: NG-C and NG-U.
NG-C connects the NG-RAN node to the Access and Mobility Management Function (AMF) and carries Next Generation Application Protocol (NGAP) signaling.
NGAP supports procedures such as initial UE message transfer, UE context management, handover coordination, paging, and PDU session resource management.
According to 3GPP TS 38.412, NGAP messages are transported using SCTP over IP.
SCTP provides reliable message delivery, multiple independent streams, congestion control, and multihoming capabilities.
These characteristics are particularly useful for maintaining signaling reliability and transport-network resilience.
The remaining options have different functions.
UDP provides connectionless transport and is used beneath GTP-U for applicable user-plane traffic.
GTP-U carries user-plane packets between the NG-RAN and UPF over the NG-U interface.
X2-C identifies the LTE X2 control-plane interface rather than the NG control-plane transport protocol.
Therefore, SCTP is the correct choice for the NG-C transport layer.
Official Reference: 3GPP TS 38.412, Sections 4.1 and 7, NG Signalling Bearer Protocol Stack and Transport Layer ; TS 38.410, NG Interface General Aspects .
NEW QUESTION # 49
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